RPN Calculator Insert into Stack

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As a user I want to be able to insert a new number after an existing number on the stack so that I can add something in I forgot.

UAT

  • [6, 4, 19, 6, 8] 3 <enter> 311 <insert> -> [6, 4, 311, 19, 6, 8]
  • [41] 1 <enter> 19 <insert> -> [19, 41]
  • [] 4 <enter> 19 <insert> --> []/error

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